Means for holding blades in cutter heads



Feb. 22,1927. 1,618,782

. C- T. ROTTLER MEANS FOR HOLDING BLADES IN CUTTER HEADS Filed Feb.- 14, 1925 lNVEN T01? 6/3/5066 ZWQ/We/ I by lock it in place.

rangement, the side walls of the opening 2 Patented Feb. 22, 1927.

UNITED STATES CLARENCE '1. ROT'ILER, OF SEATTLE, WASHINGTON.

MEANS FOR HOLDING BLADES IN CUTTER HEADS.

Application filed February The invention is a device for positively locking cutter blades in cutter heads independently and which holds the blade evenly along its entire length.

The object of the invention is to provide a simple and efiicient means for positively locking blades in cutter heads.

Another object of the invention is to pro vide a means for locking blades in cutter heads which will permit the blades to be readily removed and replaced.

And a still further object of the invention is to provide a means for holding cutter blades which will readily permit the blades to be set at dillerent distances from the center, and which will hold each blade independently.

lVith these ends in view, the invention embodies a tapering pin in a slot in which a portion of the metal is cut away around the central portion of the pin so that it will only engage the metal at the ends.

Other features and advantages of the invention will appear from the following description taken in connection with the drawings, wherein Figure 1 is a plan view of a cutter head showing the device in place, with part broken away.

Figure 2 is a sectional view through one of the openings in which the taperingpin is placed. p n

In the drawings I have shown my device as it would appear wherein numeral 1 indicates a taper pin, numeral 2 a slot in which the pin may be placed and numeral 3 a cutter head.

V The cutter head is made with slots 4: in which blades 5 may be inserted-and openings 2 parallel to and somewhat smaller than the slots 4. It will be seen that as a wedgeis placed in the opening 2, the wall 6 between the opening 2 and the opening 4: will be forced against the blade 5 and there- In this particular arare cut away from the upper edge of the cutter head, which is indicated by the numeral 7 in Figure 2 to a point 8, at the point 9 which is a short distance from the outer edge ofthe cutter head. The upper and lower ends of the opening are then cut on a taper corresponding to the taper of apin 14, 1925. Serial No. 9,334.

that may be inserted therein and as shown at the points 10 and 11. This will leave a space 12 along the central portion of the pin which will not engage the pin so that the pin will be free to engage the walls of the opening with equal force at both the top and bottom or adjacent each end.

It will be observed that by forming the opening in this manner, the pin will engage the partition 6 adjacent the upper and lower ends and thereby wedge it against the blade 5 from two distinct points so that an even gripping action will be secured against the blade.

It will be observed that changesmay be made in the construction without departing from the spirit of the invention. One of which changes may be in the design of the pin or opening as it is understood that any other shape may be used instead of being round as shown, another may be in the proportionate sizes of the pin, slot and cut ter head, and still another may be in the width or shape of the slot 2.

The construction will be readily understood from the foregoing description. To

use the device, the blade 5 may be inserted in the slot 4 and when it is in the proper position, the pin 1 may be inserted in the opening 2 and tapped at its large end so that it will wedge the partition 6 against the blade and hold it as hereinbefore described.

Having thus fully described the invention, what I claim as new and desire to secure by Letters Patent, is

1. 1113a means for holding blades in cutter heads, a tapered pin in a split tapered opening beside the said blade, said opening being formed by drilling a hole partially through the said head with one operation and then tapering the outer end of the said hole and forming a tapering opening between the end of the said hole and the end of the said head, thereby leaving a recess around the central portion of the said pin.

2.111 a means for holding blades in cutter heads, tapered openings formed by drilling a cylindrical hole part way through the head, and then forming a tapered portion at either end of the cylindrical hole so that two independent tapered bearing surfaces are formed with an intermediate recess.

CLARENCE T. ROTTLER. 

